203 lines
3.1 KiB
ArmAsm
203 lines
3.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/export.h>
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#include <asm/alternative-asm.h>
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/cpu.h>
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#include <asm/regdef.h>
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#include <asm/unwind_hints.h>
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.section .noinstr.text, "ax"
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SYM_FUNC_START(memcpy)
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/*
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* Some CPUs support hardware unaligned access
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*/
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ALTERNATIVE "b __memcpy_generic", \
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"b __memcpy_fast", CPU_FEATURE_UAL
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SYM_FUNC_END(memcpy)
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SYM_FUNC_ALIAS(__memcpy, memcpy)
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EXPORT_SYMBOL(memcpy)
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EXPORT_SYMBOL(__memcpy)
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_ASM_NOKPROBE(memcpy)
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_ASM_NOKPROBE(__memcpy)
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/*
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* void *__memcpy_generic(void *dst, const void *src, size_t n)
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*
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* a0: dst
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* a1: src
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* a2: n
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*/
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SYM_FUNC_START(__memcpy_generic)
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move a3, a0
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beqz a2, 2f
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1: ld.b t0, a1, 0
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st.b t0, a0, 0
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addi.d a0, a0, 1
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addi.d a1, a1, 1
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addi.d a2, a2, -1
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bgt a2, zero, 1b
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2: move a0, a3
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jr ra
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SYM_FUNC_END(__memcpy_generic)
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_ASM_NOKPROBE(__memcpy_generic)
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.align 5
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SYM_FUNC_START_NOALIGN(__memcpy_small)
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pcaddi t0, 8
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slli.d a2, a2, 5
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add.d t0, t0, a2
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jr t0
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.align 5
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0: jr ra
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.align 5
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1: ld.b t0, a1, 0
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st.b t0, a0, 0
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jr ra
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.align 5
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2: ld.h t0, a1, 0
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st.h t0, a0, 0
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jr ra
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.align 5
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3: ld.h t0, a1, 0
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ld.b t1, a1, 2
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st.h t0, a0, 0
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st.b t1, a0, 2
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jr ra
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.align 5
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4: ld.w t0, a1, 0
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st.w t0, a0, 0
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jr ra
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.align 5
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5: ld.w t0, a1, 0
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ld.b t1, a1, 4
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st.w t0, a0, 0
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st.b t1, a0, 4
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jr ra
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.align 5
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6: ld.w t0, a1, 0
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ld.h t1, a1, 4
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st.w t0, a0, 0
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st.h t1, a0, 4
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jr ra
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.align 5
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7: ld.w t0, a1, 0
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ld.w t1, a1, 3
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st.w t0, a0, 0
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st.w t1, a0, 3
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jr ra
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.align 5
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8: ld.d t0, a1, 0
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st.d t0, a0, 0
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jr ra
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SYM_FUNC_END(__memcpy_small)
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_ASM_NOKPROBE(__memcpy_small)
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/*
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* void *__memcpy_fast(void *dst, const void *src, size_t n)
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*
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* a0: dst
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* a1: src
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* a2: n
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*/
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SYM_FUNC_START(__memcpy_fast)
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sltui t0, a2, 9
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bnez t0, __memcpy_small
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add.d a3, a1, a2
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add.d a2, a0, a2
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ld.d a6, a1, 0
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ld.d a7, a3, -8
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/* align up destination address */
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andi t1, a0, 7
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sub.d t0, zero, t1
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addi.d t0, t0, 8
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add.d a1, a1, t0
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add.d a5, a0, t0
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addi.d a4, a3, -64
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bgeu a1, a4, .Llt64
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/* copy 64 bytes at a time */
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.Lloop64:
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ld.d t0, a1, 0
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ld.d t1, a1, 8
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ld.d t2, a1, 16
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ld.d t3, a1, 24
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ld.d t4, a1, 32
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ld.d t5, a1, 40
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ld.d t6, a1, 48
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ld.d t7, a1, 56
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addi.d a1, a1, 64
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st.d t0, a5, 0
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st.d t1, a5, 8
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st.d t2, a5, 16
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st.d t3, a5, 24
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st.d t4, a5, 32
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st.d t5, a5, 40
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st.d t6, a5, 48
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st.d t7, a5, 56
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addi.d a5, a5, 64
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bltu a1, a4, .Lloop64
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/* copy the remaining bytes */
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.Llt64:
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addi.d a4, a3, -32
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bgeu a1, a4, .Llt32
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ld.d t0, a1, 0
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ld.d t1, a1, 8
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ld.d t2, a1, 16
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ld.d t3, a1, 24
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addi.d a1, a1, 32
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st.d t0, a5, 0
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st.d t1, a5, 8
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st.d t2, a5, 16
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st.d t3, a5, 24
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addi.d a5, a5, 32
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.Llt32:
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addi.d a4, a3, -16
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bgeu a1, a4, .Llt16
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ld.d t0, a1, 0
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ld.d t1, a1, 8
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addi.d a1, a1, 16
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st.d t0, a5, 0
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st.d t1, a5, 8
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addi.d a5, a5, 16
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.Llt16:
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addi.d a4, a3, -8
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bgeu a1, a4, .Llt8
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ld.d t0, a1, 0
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st.d t0, a5, 0
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.Llt8:
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st.d a6, a0, 0
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st.d a7, a2, -8
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/* return */
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jr ra
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SYM_FUNC_END(__memcpy_fast)
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_ASM_NOKPROBE(__memcpy_fast)
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STACK_FRAME_NON_STANDARD __memcpy_small
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